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INVESTMENT SECURITIES - Summary of Available-for-Sale Debt Securities by Stated Maturity (Detail) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]
Due in one year or less, amortized cost	$ 34,170
Due after one year through five years, amortized cost	304,280
Due after five years through ten years, amortized cost	59,404
Due after ten years, amortized cost	5,000
Amortized Cost	1,928,092	$ 2,087,881
Due in one year or less, fair value	33,748
Due after one year through five years, fair value	275,437
Due after five years through ten years, fair value	51,932
Due after ten years, fair value	5,093
Fair Value	1,846,566	1,985,438
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, without single maturity date, amortized cost	230,077
Amortized Cost	230,077	14,820
Debt securities, available-for-sale, without single maturity date, fair value	228,698
Fair Value	228,698	13,236
Agency-guaranteed residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, without single maturity date, amortized cost	457,217
Amortized Cost	457,217	330,637
Debt securities, available-for-sale, without single maturity date, fair value	454,631
Fair Value	454,631	327,038
Agency-guaranteed residential collateralized mortgage obligations
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, without single maturity date, amortized cost	337,857
Amortized Cost	337,857	242,858
Debt securities, available-for-sale, without single maturity date, fair value	327,338
Fair Value	327,338	226,746
Agency-guaranteed commercial collateralized mortgage obligations
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, without single maturity date, amortized cost	97,755
Amortized Cost	97,755	95,850
Debt securities, available-for-sale, without single maturity date, fair value	94,731
Fair Value	94,731	93,075
Collateralized loan obligations
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, without single maturity date, amortized cost	10,800
Amortized Cost	10,800	257,500
Debt securities, available-for-sale, without single maturity date, fair value	10,552
Fair Value	10,552	255,407
Private label collateralized mortgage obligations
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, without single maturity date, amortized cost	391,532
Amortized Cost	391,532	502,985
Debt securities, available-for-sale, without single maturity date, fair value	364,406
Fair Value	$ 364,406	$ 475,898

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